Lamp-socket.



PATENTED AUG. 28 1906.

J. G. DALLAM.

LAMP SOCKET.

APPLICATION FILED AUG. 12. 1905 5% a OH L a nD av v m. n o J Witnesses.

UNITED STATES PATENT FETCH.

JOHN C. DALLAM, OF SCHENECTADY, NEW YORK, ASSIGNOR. TO GEN ERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORLL.

' LAMP-SOCKET.

Specification of Letters Patent.

Patented Aug. 28, 1906.

Application filed August 12,1805. Serial No. 273,891.

' tady, county of Schenectady, and State of New York, have invented certain new and useful Improvements in Lamp Sockets, of which the following is a specific ation.

This invention relates to electric lightin and its object is to provide a cheap and simp e socket for an incandescent electric lamp, especially intended for use in decorative installations where a large number of lamps are controlled by a single switch, so that no key is necessary in the individual lamp-sockets.

In such installations the sockets are strung.

along the. line-wires, which are bared where they pass through the sockets to make good connection with the socket-contacts.

The present invention aims to reduce the labor and material consumed in making such a socket, and the features of novelty are hereinafter fully set forth, and particularly pointed out in the claims. 7

In the accompanying drawings, Figure 1 is a side elevation of a complete socket cinbodying my invention. Fig. 2 is a longitudin al section of the same on the line 2 2, Fig. 3. Fig. 3 an end View with the cap removed; and Fig. 4 is a longitudinal section on the line 4 at, Fig. 3, showing,a modified form of cap.

The socket comprises a cup-shaped body 1, of insulating material, preferably molded porcelain. It is preferably circular in crosssection and surrounds a screw-threaded metallic shell '2, which has flanges 3, through which pass fastening-screws 4 5. The screw 4 'meshes with a nut'6, held in a polygonal recess 7 in the top of said body 1, the recess being filled with pitchor cement, if desired. The screw 5 enters a tapped hole in one end of a metallic strip 8, lying in a recess 9 in the top of said body and intersecting one of two parallcl grooves 10 11 formed across the top of said body on either side of the center thereof. .A binding-screw 12 passes through that end of the strip 8 which lies in the groove 10, the head of said screw being p artly received in a side recess 13. The screw-threaded shell 2 is notched at each side to lit over a rib 14, extending across the inner end of the body 1. A long screw 15 passes through this rib, its head being preferably countersunk therein and provided with a thin metal washer 16. The screw also passes through a metal strip 17,

placed across the groove 11', with its ends received in lateral recesses 18 19, extending therefrom. This strip has a binding-screw 20. The long screw 15 PlOjGCtS beyond the end of the body 1 into a nut .21,securcd in acap 22, of molded porcelain or the like, which is preferably circular and has a flange 23 fitting over the edge of said body. As the screw 15 is in the center of the body, the cap can be screwed on by simply engaging the nut with thescrew and then rotating said cap. The nut is located in a countersunk hole 24,Where it is secured by cement 251 When the socket is to be suspended by a cord, the cap is made as shown in Figs. 1 and 2, with a knob 26, having a transverse hole 27, through which the cord can be run; but if the socket is to be fastened to a ceiling or wall or other stationary support it is better to use the cap shown in Fig. 1, which has a [hit base eXtending beyond the body 1 and provided with holes 28 for fastcning-screws In using this socket the cap is unscrewed and the two line-wires are laid in the grooves 10 11, their insulation having been removed at these points to permit the binding-screws 12 20 to make good electrical contact with them. This puts the screw-tin'eadcd shell .2 in circuit with one line-wire and the central screw 15 in circuit with the other line-wire in readiness to make contact with the lampterminals when the lamp is screwed into the socket. The cap is then screwed on again, and the socket is ready to be hung up or fastened to its support.

What I claim as new, and desire to secure by Letters Patent of the United States, i

1. An electric-lamp socket, comprising a cup-shaped body and a cap therefor, a shellcontact secured in said body, a center contact fixed in the center of said body and having a threaded end projecting beyond said body, and a nut centrally fixed in said cap and cooperating with said center contact, whereby said parts can be secured together by rotating one with reference to the other.

An electric-lamp socket, comprising a cup-shaped body having parallel grooves across its end and recesses extending from each side of each groove, metal strips reachwhich it is secured and beyond which it pro jects, a shell-contact in said body and e0nnected with the other strip, and s-csp having a central nut to engage with the projecting end of the center-contact screw.

3. *An electricdsmp socket, comprising a cup-shaped. body circular in crossesection and having parallel grooves across its end and side recesses extending therefrom, metal strips placed scross said grooves and in said recesses, binding-screws'in said strips, a shellcontsct in said body eonnected with one of said strips, a'fixed center-contact screw passing through the end (if said body and secured to the other strip, a cap having a circular 15 flange fitting over the edge of said body, and providedwith a central hole, and a nut cemented in said hole and meshing with said contact-screw.

In witness whereof I have hereunto set my 20 hand this 10th day of August, 1905.

JOHN DALLAM. Witnesses:

BENJAMIN B. HULL, HELEN ORFORD. 

